<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<select name="city" lay-verify="required">
        <option value=""></option>
        <option value="0">北京</option>
        <option value="1">上海</option>
        <option value="2">广州</option>
        <option value="3">深圳</option>
        <option value="4">杭州</option>
      </select>
</body>
</html>